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UCC3946PWG4 Datasheet(PDF) 4 Page - Texas Instruments |
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UCC3946PWG4 Datasheet(HTML) 4 Page - Texas Instruments |
4 / 17 page UCC2946 UCC3946 SLUS247F − APRIL 1997 − REVISED NOVEMBER 2007 4 www.ti.com APPLICATION INFORMATION The UCCx946 supervisory circuit provides accurate reset and watchdog functions for a variety of microprocessor applications. The reset circuit prevents the microprocessor from executing code during undervoltage conditions, typically during power-up and power-down. In order to prevent erratic operation in the presence of noise, voltage glitches where voltage amplitude and time duration are less than the values specified in Figure 1 are ignored. 100 40 0 110 120 130 140 150 160 170 180 20 100 60 80 120 180 140 160 200 Figure 1. OVERDRIVE VOLTAGE WITH RESPECT TO RESET THRESHOLD vs DELAY TO OUTPUT LOW ON RESB TDELAY − Delay Time − µs RT Senses Glitch, RES Goes Low for Reset Period Glitches Ignored, RESB Remains High The watchdog circuit monitors the microprocessor’s activity, if the microprocessor does not toggle WDI during the programmable watchdog period WDO goes low, alerting the microprocessor’s interrupt of a fault. The WDO pin is typically connected to the non-maskable input of the microprocessor so that an error recovery routine can be executed. |
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